Add and unify one!, zero!, neg! methods for arb types

[fingolfin]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 68.49315% with 46 lines in your changes missing coverage. Please review.

Project coverage is 87.25%. Comparing base (677fbcf) to head (e9ec375).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/arb/Complex.jl	77.27%	5 Missing ⚠️
src/arb/ComplexPoly.jl	54.54%	5 Missing ⚠️
src/arb/RealPoly.jl	37.50%	5 Missing ⚠️
src/arb/acb.jl	76.19%	5 Missing ⚠️
src/arb/acb_poly.jl	54.54%	5 Missing ⚠️
src/arb/arb_poly.jl	37.50%	5 Missing ⚠️
src/arb/ComplexMat.jl	75.00%	3 Missing ⚠️
src/arb/RealMat.jl	75.00%	3 Missing ⚠️
src/arb/acb_mat.jl	75.00%	3 Missing ⚠️
src/arb/arb_mat.jl	75.00%	3 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1900      +/-   ##
==========================================
+ Coverage   87.22%   87.25%   +0.02%     
==========================================
  Files          97       97              
  Lines       35652    35655       +3     
==========================================
+ Hits        31098    31109      +11     
+ Misses       4554     4546       -8     

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[lgoettgens]

Look good, thanks!